Gbrainy is a brain teaser game and trainer to have fun and to keep 
your brain trained.

It provides the following types of games:

* Logic puzzles. Games designed to challenge your reasoning and 
  thinking skills.
* Mental calculation. Games based on arithmetical operations designed 
  to prove your mental calculation skills.
* Memory trainers. Games designed to challenge your short term memory.
* Verbal analogies. Games that challenge your verbal aptitude
